Preservative composition



Fatenterl Mar. 14, i933 STA ES JAMES ONE-FOURTH T W. TA?LII I ANDONE-FOURTH T0 DONALD OF EGEILAND, OREGQN E. BROOKS AND JACOB GOLDSTONE,0F PQRTLADID, OBEGGN, ASSIGNOES OF RZCHABDS, BOTH PRESERVATIVECOMIOSITIUN N0 lirawing. Application filed July 23,

This invention relates to a preservative composition designed primarilyfor rubber blankets employed in printing presses, but it is to beunderstood that a composition, in

accordance with this invention may be used to obtain'a preservativeaction for and in connection with any type of blanket or for any otherarticle or object for which it is found applicable, and the inventionhas for its object to provide, in a manner as herein after set forth, acomposition of the class referred to which, when applied to the blank etwill form a coating or film on the face, back and edges thereof and bepermanently associated with the blanket to make the latter inkrepellent, impervious to ink, oil, water and allied products without inany manner destroying or impairing the pliability, flexibility andresiliency of the material from which the blanket is formed under suchconditions materially prolonging the life of the blanket.

Stereotype, electrotype and other kinds of printing plates used forprinting on printing presses a e seldom accurate on the printing planeand on the printing surfaces. F or the purpose of correcting saidimperfections a pliable, flexible and resilient blanket or packinghaving uniform thicknesses and of a sufficie t height and thickness forprinting thereon, is necessary to be placed and fastened upon the faceof the impression cylinders, so as to support the paper while in theprocess of being printed, adjusting uniform- 35 ly the printedimpression, and thereby producing auniform and clear printed impressionon the paper.

The various kinds of printing press blankets heretofore produced, madefrom different kinds of pliable, flexible and resilient substances,deteriorate readily unless the substances contained in the blankets aremade impervient to ink, oils contained in ink, other oils and water.

Printing press blanks s composed of vulcanized rubber contain greatpliability, flexibi .y and uniform resiliency, and by the use produceuniform printed impression at all points, and makes possible the pro-1929. Serial No. 380,453.

duction of uniform printed impressions on the paper, but the lifethereof is short, because of the fact that they are not repellent toink, nor impervious to oils contained in printers ink, or other oils,and because of said fact their use has been of comparatively shortduration.

Ink, oil contained in oils used in and about a printing plant orprinting press, and water readily destroy the elasticity, pliability andresiliency of the substances contained in printing press blankets.

The purpose of this invention is to provide a. composition (in liquidform) which, when properly applied, will produce a smooth, uniform,non-porous, elastic and flexible coating or film, permanently associatedtothe body portion, on the face, back and edges of a vulcanized rubberblanket, and other kinds of blankets made from pliable, flexible andresilient substances, repellentto ink and impervious to printers ink,oils contained in printers ink, other oils and water, without in anymanner deteriorating or destroying the elasticity, pliability orresiliency of the various substances containedin printing pressblankets.

To produce a smooth, non-porous, uniform, elastic and flexible coatingor film, and which will become permanently associated to the bodyportion, on a vulcanized rubber printing press blanket and otherblankets made from pliable, flexible and resilient substances, and whichis repellent to ink, and impervious to ink, oils contained in printersink, other oils and water, and without destroying the elasticity,pliability and resiliency of the substances contained in printing pressblankets is the primary object of this invention and which is attainedby a composition formed from a coloring substance, waX, varnish, adrier, pure gum spirits of turpentine and mineral turpentine.

Preferably the composition will be formed from a coloring substance,such as carborvar carbon black or a mineral coloring to provide thecomposition of a color other than black, it carborvar carbon black wasemployed, bees wax, W68 long China jVOOCl oil varnish, a

printers ink, other drier such as suprex japan, pure gum spirits ofturpentine and mineral turpentine. In lieu of the #208 long China woodoil-varnish, there may be substituted any varnish made with China woodoil, long China wood oil or a combination of China wood oil and linseedoil varnish.

Preferably theproportions of the ingredients are as follows:

Coloring substance 5 pounds ax 6/10 pound Varnish 8 gallons Drier gallonPure gum turpentine 2 gallons Mineral turpentine 1 gallons Theproportions as named will make about twelve (12) gallons of thecomposition in liquid form. The same proportions should be used if alesser quantity is desired.

The pure gum turpentine used is the commonly know turpentine as obtainedby the distillation of a natural oleo-resin which exudes from variousspecies of trees belonging to the Conifer. he mineral turpentine employed is the commonly used substitute for turpentine which is adistillate of petroleum.

The foregoing ingredients are combined in a finished product by thefollowing method:

Take four (l) gallons of #268 long China wood oil varnish and heat to300 degrees; then add 6/10 lb. bees wax (or other wax) stir thoroughlyuntil wax is thoroughly dissolved; then add five lbs. of carborvarcarbon black, (if other colors are desired add '5 lbs. of any othermineral coloring); then add remaining 4 gallons of 68 long China woodoil varnish; gallon of dryer (suprex japan), or any other good dryer; 2gallons pure gum spirits turpentine, and 1 gallons mineral turpentine;mix thoroughly.

The foregoing ingredients when properly mixed, are applied to both sidesand the edges of a vulcanized rubber printing press blanket, and toother printing press blankets made of elastic, pliable and resilientsubstances, by applying the same with a brush or by the use of a sprayor other mechanical means. After the substance has been allowed to dryany additional coats of the same compound can be applied in a likemanner.

The physical and chemical characteristics of mineral turpentine and gumturpentine are as follows:

Mineral turpentine Color (Saybolt) Not darker than 21 Flash point (tag.closed) Not below 100 F. \Vhite lead test Negative Doctor test NegativeCorrosion test A clean copper strip when submerged for hour in theMineral Turps at its boiling point shall show no marked tarnishing. Avery slight tarnish will be disregarded. Distillation The distillatebelow 320 F. (150 C.) shall not exceed 5%. The end point shall not behigher than 146 F. (230 C.) Acidity The residue remaining in the flaskafter distillation is completed shall be neutral in residue.

What we claim is:

1. An ink repellant, preservative composition for printing pressblankets consisting of five pounds of a coloring substance sixtenths ofa pound of bees wax, eight gallons of long China wood oil varnish,threequarters of a gallon of drier, two gallons of pure gum spirits ofturpentine, and one and one-quarter gallons of mineral turpentine.

2. A combined ink repellant and preservative for printing press blanketscomprising a liquid body for coating the blanket in a film like form,said body consisting of live pounds of a coloring substance, six-tenthsof a pound. r of beeswax, eight gallons of long China wood oil varnish,three-quarters of a gallon of a drier, two gallons of pure gum spiritsof turpentine and one and one-quarter gallons of mineral turpentine,said body possessing a the characteristics of uniting with andpreserving the blanket when applied to the latter without destroying orinjuring the elasticity, pliability or resiliency of the blanket, andsaid body possessing pliable, elastic, flexible, a soft, smooth,non-porous, ink-repellant, an impervious characteristics.

In testimony whereof, we aiflx our signatures hereto.

- JAMES H. BROOKS. JACOB GOLDSTONE.

